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Merge pull request #355 from lioncash/simp 

armemu: Simplify some instructions.
This commit is contained in:
bunnei 2014-12-28 22:20:49 -05:00
parent 5763d40319 6ce2a38ec4
commit df728cb4c2
1 changed files with 148 additions and 231 deletions
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379
src/core/arm/interpreter/armemu.cpp
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@ -6264,129 +6264,94 @@ L_stm_s_takeabort:
return 1; return 1;
} }
} }
printf("Unhandled v6 insn: pkh/sxtab/selsxtb\n"); printf("Unhandled v6 insn: pkh/sxtab/selsxtb\n");
break; break;
case 0x6a: {
ARMword Rm;
int ror = -1;
switch (BITS(4, 11)) { case 0x6a: // SSAT, SSAT16, SXTB, and SXTAB
case 0x07:
ror = 0;
break;
case 0x47:
ror = 8;
break;
case 0x87:
ror = 16;
break;
case 0xc7:
ror = 24;
break;
case 0x01:
case 0xf3:
//ichfly
//SSAT16
{
const u8 rd_idx = BITS(12, 15);
const u8 rn_idx = BITS(0, 3);
const u8 num_bits = BITS(16, 19) + 1;
const s16 min = -(0x8000 >> (16 - num_bits));
const s16 max = (0x7FFF >> (16 - num_bits));
s16 rn_lo = (state->Reg[rn_idx]);
s16 rn_hi = (state->Reg[rn_idx] >> 16);
if (rn_lo > max) {
rn_lo = max;
SETQ;
} else if (rn_lo < min) {
rn_lo = min;
SETQ;
}
if (rn_hi > max) {
rn_hi = max;
SETQ;
} else if (rn_hi < min) {
rn_hi = min;
SETQ;
}
state->Reg[rd_idx] = (rn_lo & 0xFFFF) | ((rn_hi & 0xFFFF) << 16);
return 1;
}
default:
break;
}
if (ror == -1) {
if (BITS(4, 6) == 0x7) {
printf("Unhandled v6 insn: ssat\n");
return 0;
}
break;
}
Rm = ((state->Reg[BITS(0, 3)] >> ror) & 0xFF) | (((state->Reg[BITS(0, 3)] << (32 - ror)) & 0xFF) & 0xFF);
if (Rm & 0x80)
Rm |= 0xffffff00;
if (BITS(16, 19) == 0xf)
/* SXTB */
state->Reg[BITS(12, 15)] = Rm;
else
/* SXTAB */
state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + Rm;
return 1;
}
case 0x6b:
{ {
ARMword Rm; const u8 op2 = BITS(5, 7);
int ror = -1;
switch (BITS(4, 11)) { // SSAT16
case 0x07: if (op2 == 0x01) {
ror = 0; const u8 rd_idx = BITS(12, 15);
break; const u8 rn_idx = BITS(0, 3);
case 0x47: const u8 num_bits = BITS(16, 19) + 1;
ror = 8; const s16 min = -(0x8000 >> (16 - num_bits));
break; const s16 max = (0x7FFF >> (16 - num_bits));
case 0x87: s16 rn_lo = (state->Reg[rn_idx]);
ror = 16; s16 rn_hi = (state->Reg[rn_idx] >> 16);
break;
case 0xc7:
ror = 24;
break;
case 0xf3: // REV if (rn_lo > max) {
DEST = ((RHS & 0xFF) << 24) | ((RHS & 0xFF00)) << 8 | ((RHS & 0xFF0000) >> 8) | ((RHS & 0xFF000000) >> 24); rn_lo = max;
return 1; SETQ;
case 0xfb: // REV16 } else if (rn_lo < min) {
DEST = ((RHS & 0xFF) << 8) | ((RHS & 0xFF00)) >> 8 | ((RHS & 0xFF0000) << 8) | ((RHS & 0xFF000000) >> 8); rn_lo = min;
return 1; SETQ;
default: }
break;
if (rn_hi > max) {
rn_hi = max;
SETQ;
} else if (rn_hi < min) {
rn_hi = min;
SETQ;
}
state->Reg[rd_idx] = (rn_lo & 0xFFFF) | ((rn_hi & 0xFFFF) << 16);
return 1;
} }
else if (op2 == 0x03) {
const u8 rotation = BITS(10, 11) * 8;
u32 rm = ((state->Reg[BITS(0, 3)] >> rotation) & 0xFF) | (((state->Reg[BITS(0, 3)] << (32 - rotation)) & 0xFF) & 0xFF);
if (rm & 0x80)
rm |= 0xffffff00;
// SXTB, otherwise SXTAB
if (BITS(16, 19) == 0xf)
state->Reg[BITS(12, 15)] = rm;
else
state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + rm;
if (ror == -1) return 1;
break; }
else {
Rm = ((state->Reg[BITS(0, 3)] >> ror) & 0xFFFF) | (((state->Reg[BITS(0, 3)] << (32 - ror)) & 0xFFFF) & 0xFFFF); printf("Unimplemented op: SSAT");
if (Rm & 0x8000) }
Rm |= 0xffff0000;
if (BITS(16, 19) == 0xf)
/* SXTH */
state->Reg[BITS(12, 15)] = Rm;
else
/* SXTAH */
state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + Rm;
return 1;
} }
break;
case 0x6b: // REV, REV16, SXTH, and SXTAH
{
const u8 op2 = BITS(5, 7);
// REV
if (op2 == 0x01) {
DEST = ((RHS & 0xFF) << 24) | ((RHS & 0xFF00)) << 8 | ((RHS & 0xFF0000) >> 8) | ((RHS & 0xFF000000) >> 24);
return 1;
}
// REV16
else if (op2 == 0x05) {
DEST = ((RHS & 0xFF) << 8) | ((RHS & 0xFF00)) >> 8 | ((RHS & 0xFF0000) << 8) | ((RHS & 0xFF000000) >> 8);
return 1;
}
else if (op2 == 0x03) {
const u8 rotate = BITS(10, 11) * 8;
u32 rm = ((state->Reg[BITS(0, 3)] >> rotate) & 0xFFFF) | (((state->Reg[BITS(0, 3)] << (32 - rotate)) & 0xFFFF) & 0xFFFF);
if (rm & 0x8000)
rm |= 0xffff0000;
// SXTH, otherwise SXTAH
if (BITS(16, 19) == 15)
state->Reg[BITS(12, 15)] = rm;
else
state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + rm;
return 1;
}
}
break;
case 0x6c: // UXTB16 and UXTAB16 case 0x6c: // UXTB16 and UXTAB16
{ {
const u8 rm_idx = BITS(0, 3); const u8 rm_idx = BITS(0, 3);
@ -6414,132 +6379,84 @@ L_stm_s_takeabort:
return 1; return 1;
} }
break; break;
case 0x6e: { case 0x6e: // USAT, USAT16, UXTB, and UXTAB
ARMword Rm; {
int ror = -1; const u8 op2 = BITS(5, 7);
switch (BITS(4, 11)) { // USAT16
case 0x07: if (op2 == 0x01) {
ror = 0; const u8 rd_idx = BITS(12, 15);
break; const u8 rn_idx = BITS(0, 3);
case 0x47: const u8 num_bits = BITS(16, 19);
ror = 8; const s16 max = 0xFFFF >> (16 - num_bits);
break; s16 rn_lo = (state->Reg[rn_idx]);
case 0x87: s16 rn_hi = (state->Reg[rn_idx] >> 16);
ror = 16;
break; if (max < rn_lo) {
case 0xc7: rn_lo = max;
ror = 24; SETQ;
break; } else if (rn_lo < 0) {
rn_lo = 0;
case 0x01: SETQ;
case 0xf3:
//ichfly
//USAT16
{
const u8 rd_idx = BITS(12, 15);
const u8 rn_idx = BITS(0, 3);
const u8 num_bits = BITS(16, 19);
const s16 max = 0xFFFF >> (16 - num_bits);
s16 rn_lo = (state->Reg[rn_idx]);
s16 rn_hi = (state->Reg[rn_idx] >> 16);
if (max < rn_lo) {
rn_lo = max;
SETQ;
} else if (rn_lo < 0) {
rn_lo = 0;
SETQ;
}
if (max < rn_hi) {
rn_hi = max;
SETQ;
} else if (rn_hi < 0) {
rn_hi = 0;
SETQ;
}
state->Reg[rd_idx] = (rn_lo & 0xFFFF) | ((rn_hi << 16) & 0xFFFF);
return 1;
} }
default: if (max < rn_hi) {
break; rn_hi = max;
} SETQ;
} else if (rn_hi < 0) {
if (ror == -1) { rn_hi = 0;
if (BITS(4, 6) == 0x7) { SETQ;
printf("Unhandled v6 insn: usat\n");
return 0;
} }
break;
state->Reg[rd_idx] = (rn_lo & 0xFFFF) | ((rn_hi << 16) & 0xFFFF);
return 1;
} }
else if (op2 == 0x03) {
Rm = ((state->Reg[BITS(0, 3)] >> ror) & 0xFF) | (((state->Reg[BITS(0, 3)] << (32 - ror)) & 0xFF) & 0xFF); const u8 rotate = BITS(10, 11) * 8;
const u32 rm = ((state->Reg[BITS(0, 3)] >> rotate) & 0xFF) | (((state->Reg[BITS(0, 3)] << (32 - rotate)) & 0xFF) & 0xFF);
if (BITS(16, 19) == 0xf)
if (BITS(16, 19) == 0xf)
/* UXTB */ /* UXTB */
state->Reg[BITS(12, 15)] = Rm; state->Reg[BITS(12, 15)] = rm;
else else
/* UXTAB */ /* UXTAB */
state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + Rm; state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + rm;
return 1; return 1;
}
case 0x6f: {
ARMword Rm;
int ror = -1;
switch (BITS(4, 11)) {
case 0x07:
ror = 0;
break;
case 0x47:
ror = 8;
break;
case 0x87:
ror = 16;
break;
case 0xc7:
ror = 24;
break;
case 0xfb: // REVSH
{
DEST = ((RHS & 0xFF) << 8) | ((RHS & 0xFF00) >> 8);
if (DEST & 0x8000)
DEST |= 0xffff0000;
return 1;
}
default:
break;
}
if (ror == -1)
break;
Rm = ((state->Reg[BITS(0, 3)] >> ror) & 0xFFFF) | (((state->Reg[BITS(0, 3)] << (32 - ror)) & 0xFFFF) & 0xFFFF);
/* UXT */
/* state->Reg[BITS (12, 15)] = Rm; */
/* dyf add */
if (BITS(16, 19) == 0xf) {
state->Reg[BITS(12, 15)] = Rm;
} }
else { else {
/* UXTAH */ printf("Unimplemented op: USAT");
/* state->Reg[BITS (12, 15)] = state->Reg [BITS (16, 19)] + Rm; */
// printf("rd is %x rn is %x rm is %x rotate is %x\n", state->Reg[BITS (12, 15)], state->Reg[BITS (16, 19)]
// , Rm, BITS(10, 11));
// printf("icounter is %lld\n", state->NumInstrs);
state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + Rm;
// printf("rd is %x\n", state->Reg[BITS (12, 15)]);
// exit(-1);
} }
}
break;
return 1; case 0x6f: // UXTH, UXTAH, and REVSH.
{
const u8 op2 = BITS(5, 7);
// REVSH
if (op2 == 0x05) {
DEST = ((RHS & 0xFF) << 8) | ((RHS & 0xFF00) >> 8);
if (DEST & 0x8000)
DEST |= 0xffff0000;
return 1;
}
// UXTH and UXTAH
else if (op2 == 0x03) {
const u8 rotate = BITS(10, 11) * 8;
const ARMword rm = ((state->Reg[BITS(0, 3)] >> rotate) & 0xFFFF) | (((state->Reg[BITS(0, 3)] << (32 - rotate)) & 0xFFFF) & 0xFFFF);
// UXTH
if (BITS(16, 19) == 0xf) {
state->Reg[BITS(12, 15)] = rm;
}
// UXTAH
else {
state->Reg[BITS(12, 15)] = state->Reg[BITS(16, 19)] + rm;
}
return 1;
}
} }
case 0x70: case 0x70:
// ichfly // ichfly